View Full Version : New Kelling CNC router...

12-17-2009, 08:39 AM
Hi All,

I just finished my new CNC build, using ALL keling components...the thing rocks!

Here is a video of it, "air cutting" a Les-Paul top....very happy with the build

YouTube- CNC aircut LP

Using KL-9082's on all axes, running them with a 60V power supply to the motors...very happy with the performance of the drivers, and these things are build like a tank...really liking the integrated heat sinks on the drivers...
Motors are wired in parallel, 500Oz/in on x/y and 380Oz/In on the Z....

All ball screws and linear rails....

What do you think?

12-17-2009, 08:48 AM
Do you get any flex in the gantry sides, say, if you push on them? They look a little weak. Other than that, looks great. Is 400ipm the max speed?

12-17-2009, 09:07 AM
whats up with the leds. how are they wired up into this. nice job.

12-17-2009, 09:22 AM
Very nice build! What are your travels?

12-17-2009, 09:36 AM
Thank all....

No flex that I can detect.....but I will put a dial caliper on it to see..I am sure there is some...but for cutting wood, I do not think it will be an issue...we shall see....

travels are 42 x32 x6.5 for the x-y-z respectively.

I can probably go faster than 400 IPM, but I found out that my computer which I am using, is not good at pulsing higher....that is plenty fast for me at this point....will probably consider an external pulsing engine at some time.....

Not sure what you mean by the leads being wired? you mean to the keling driver or to the motors?

12-17-2009, 01:30 PM
i was talking about LEDS lights , they behave like resistors (kind of) so i was wondering ow you tied them into the wiring of your controller?

12-17-2009, 03:27 PM
Nice job!

What are you running for screw pitch? Also are you reducing the stepper drive at all? Your pulleys almost look 1:1

last question - what micro step setting are you using


12-17-2009, 06:52 PM
-The Breakout board I am using, had an option for an LED board...I would not say that LED's act like resistors..be-careful of that....

Look here:


And browse for their LED break-out board..works quite well!!

-The screw pitch is .2....and no, I am not reducing the stepper drive...curious to see why that might be a good thing/bad thing to do? I guess I can get faster speeds, with the same pulse rate if I was reducing it....is that why you asked? Now you have picked my curiosity :-)

I do not recall at the moment what micro-stepping I have on the drivers (I believe I have them at 128), but will need to confirm with my jumper settings, as it has been about 4 months since I build the controller.

I checked the travel with a digital caliper on all axes, and it is spot on....

12-18-2009, 01:35 AM
-The Breakout board I am using, had an option for an LED board...I would not say that LED's act like resistors..be-careful of that....

i know, i just meant that they do not work for free and would screw things up if just stuck where ever......

12-18-2009, 02:52 AM

Adjusting your micro stepping to 10 would still produce .0001 resolution with your .2 tpi screws.

That would reduce your steps per from 128000 to 10000.

Your computer would not have to work very hard, and would have pulses to spare.


12-18-2009, 09:44 PM
THAT makes perfect sense!!! Thank you for that!

I will try that...and see how high I can push this thing....

12-19-2009, 12:04 AM
Nice Job !
400 in/min with a 5 turn/inch screw is about 2000 rpm on the screw. For a stepper ,thats wailing Man !

Are you worried about wood dust getting in the ball screws ?

12-19-2009, 10:00 AM

Well the nuts have a plastic "wiper" on them, that should trap most dust before it enters the ball nut.....but I am sure over time, they will trap some dust...not sure how I will handle that..I have heard of people using lubricants (like light machine oil) on the screws, that usually does a good job of expelling any dust. We shall see...Same for the linear rails....

As you can also see, the x-screw is right under the table, and protected from dust....the y is also somewhat burried under the z-carriage, but the z is pretty much exposed. I plan on designing a dust hood for it, and this should trap all the smaller dust particles. I made a mock up of one in MDF, and used it to cut slots in the MDF table for the aluminum t-slot/hold downs. The hood did an awesome job at collecting the MDF dust (which is notorious) so I am confident it will do a good job at wood dust, using a standard shop vacuum (ala Home Depot brand).

My primary purpose is guitar/neck cutting and machining. Mahogany, Spanish Cedar, Maple, rosewoods and ebony. We shall see...so far, it has been quite an improvement over my first Solsylva wooden machine.

I can't say enough about the Keling drivers!

I tried using the xylotex controller I had build for my older machine, and it would not cut it....just did not have the "oomph" to drive this thing.....the keling drivers, and keling power supply, are absolutely making my steppers hum!

I will try posting some more videos cutting etc....


12-19-2009, 01:04 PM
The CNC machine (router) which I am currenty using is one which I build my self. ......I am currently using it with a Xylotex controller, and Xylotex motors . I get about 30IPM for cutting, and about 40IPM for rapids. This is more than what I need,

LOL ;) I guess things have changed a bit since you wrote this on your website.

.I have heard of people using lubricants (like light machine oil) on the screws, that usually does a good job of expelling any dust.
You mean attracting the dust !. Graphite or Teflon spray works good and stays dry so dust doesn't stick to it.

Larry K

12-19-2009, 04:55 PM

After waiting for 3+ hours to cut a neck...yeah...I would say things have changed!

Why is speed always so "addictive??????" I mean, you get a faster computer, faster car, or in this case, a faster CNC machine, and you can never go back!!


So...tell me, are those the preferred lubricants for rails and ball screws? Rails came pre-lubed with grease, and have grease fittings...what do people normally use? I have not been able to find much information on the subject matter...